diff --git a/libraries/SITL/SIM_GPS.cpp b/libraries/SITL/SIM_GPS.cpp
index 59edc0f8ed..8b28d30920 100644
--- a/libraries/SITL/SIM_GPS.cpp
+++ b/libraries/SITL/SIM_GPS.cpp
@@ -18,6 +18,7 @@
 #include <AP_BoardConfig/AP_BoardConfig.h>
 #include <AP_HAL/AP_HAL.h>
 #include <SITL/SITL.h>
+#include <AP_InternalError/AP_InternalError.h>
 #include <AP_Common/NMEA.h>
 #include <AP_HAL/utility/sparse-endian.h>